<div class="row">

  <div class="col-xs-1 col-sm-1">
    <a class="btn btn-default btn-block" ng-click="goBack()">返回</a>
  </div>

  <div class="col-xs-5 col-sm-5">
    <h2 class="text-info lead" style="margin-top: 0em">{{ currLesson.name }}</h2>
  </div>

  <div class="col-xs-6 col-sm-offset-2 col-sm-4">
    <module-third-nav parent-state-name="lesson.show" nav-items="navItems"></module-third-nav>
  </div>

</div>